Stoper feed control



March 22, 1932. M. o FARRELL STOPER FEED CONTROL Filed March 27, 1926 INVENTOR. Monfhew 0 Farrell 19% a ATTORNEY.

Patented Mar. 22, 1932 UNITED STATES PATENT OFFICE MATTHEW OFARRELL, F DETROIT, MICHIGAN, ASSIGNOR TO CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY STOPER FEED CONTROL Application filed March 27, 1926. Serial No. 97,870.

' with a feed leg operated by the motive fluid for feeding the drill bit to the work.

In machines of the type described the motive fluid supply to both the percussive motor and to the feed leg is ordinarily controlled by 10 the throttle valve. In practice irregularities in the formation being drilled make it necessary quickly to vary the action of the feed leg. To do this by the throttle valve is not practical since the operator does not ordinarily have his hand upon this valve and a hasty movement of it is likely to modify the operation of the percussive motor. Moreover the throttle valve does not lend itself to instant and accurate adjustment of the operation of the feed leg. Attempts have heretofore been made to improve this condition by providing a supplemental control for the feed leg mounted upon or adjacent to the steadying handle of the stoper. I

Among the objects of the invention are to provide a more positive and more flexible means of control for the feeding mechanism, to provide for varying the motive fluid supply directly from the steadying handle, and in general to improve prior arrangements in the interest of more satisfactory and eflicient operation of drilling machines having a fluid pressure feeding device.

The invention consists in providing a supplemental throttle valve in the steadying handle for complete control of the supply for the feed leg. This is accomplished by directing the passage from the pressure fluid supply ot the machine through the steadying handle and thence to the feed leg. The supplemental control valve is so arranged in the steadying handle as to control this passage and to be available for instant operation completely to control the motive fluid supply, to stop the supply, or to vent the feed leg. This arrangement provides convenient means for securing any desired movement of the feed leg and avoids the loss of motive fluid resulting with prior arrangements in which only a vent, is provided upon the steadying handle.

In order to illustrate the invention, one concrete embodiment thereof is disclosed in the accompanying drawings in which:

Fig. 1 is a side elevational view.

Fig. 2 is a longitudinal sectional view substantially on the line 22 of Fig. 1.

Fig. 3 is a transverse sectional view substantially on the line 3-3 of Fig. 2.

F 1g. 4 is an end elevational view, partly in section, of the grip portion of the steadying handle.

Fig. 5 is a view similar to Fig. 4, showing the control valve in a different position.

Fig. 1 discloses a drilling machine ofthe stoper type comprising a percussive motor A, having a front head or chuck a for the work ing tool or drill steel (not shown) which is arranged to be advanced to the work bythe usua1 feed leg device B. The motor A and leg B are joined together by the back head a of the percussive motor, in which head is disposed the throttle valve 6 with its handle 6 and also the steadying handle 7 with its grip portion 7 by which the entire machine may be manually rotated or rocked to assist in the drilling operation. The pressure fluid supply pipe 8 connectsdirectly with the throttle valve 6 in accordance with the usual prac tice; The percussive motor A and the feed leg assembly B may be of any suitable or desired type and, since they form no part of the present invention, further descriptionof the same is omitted. a

7 To give the operator complete and convenient control of the operation of the feed leg, suitable means for this purpose are provided upon the steadying handle 7. To this end the steadying handle is arranged to provide a part of the motive fluid passage extending to feed leg B and has a control valve or'supplemental throttle disposed upon the grip portion 7. As indicated in Fig. 3, the steadying handle 7 extends through back head a and is held therein in fixed position by suitable means including nut 9 and lock washer 10. Within the shank of the handle 7 are spaced parallel passages 11 and 12. Passage 11 at its inner end connects with an angular passage 11 (Fig. 2) extending to feed leg B, and passage 12 connects with a passage 12' eeenneeted-ite p ssag il ian eiiranged o teen-c Beet .=l.e.t .e f eithe to Pa sage 1. .elrh e small port 14 in the handle 7 leading to atmosphere. Block 13 is held in borelm byia perforated retainer 15 sleeved over the proesting shank 13a of block 18 and having a ee w thread ngagemen n h h e- A e htre iha d is se med to hank 1 and t' hQSshee frietien i ve Ye-,.ho di e tact with the upper face of retainer 15 by 9 ree enze eee llf 'n tihafi se d' e eeim- "terbore in retainer 15 and bearing against the heed efLbI Qek 3 As 'is cleanly ,apparent the above ar'rangemeat n ke the leentre ,e t e e leg B mes r lenveni nt- T p t r keeps' one hand upon the steadying handle ,7 when hun ihg he i r l and since th trigger 'or control 16 of valve 13 is directly uponlthe :heiihetent y ii gii e ed- Such i f hentte mes nhe en in ee ihe a JIHUIIEIIQSUHS ,iw hh d i l ng m h of t adese ihed hype part i v wh de i :i

f ye r ngte ture- If the pei e fth .e'hin 5 s nee ih ea e il stnate he PQS q of th yii ye handle 16 wehenthe and p essu e i passing in full volume to the feed ,leg- 13y "e ki igj-hhe .reeh rel hehd e l6 s ght y i eithefdirection the pressure supply may .be negnlet d t any d i ed ext nt .IIP

sw nging th h nd e-1,6 h t e t hor onta eslhen (Eig- .5) th Pp y-efith pre su ides the feed legis cut off and the ipressure inhhe leg s ent througha me ph r pe la l h ndl 1 is sw n te -h l ig hor I.Z .h e posi i nt e i ust a e 'p es ux et pn d.i it eiee l a 3 While but ,one form of the invention has I b en h ein ehei a d eser d t s o h nndere eed that :the i v ti is t m ted ,tothe specific ,details thereof but covers all \eh ege yhie ifie e s e l pi h ens ithn the s pe hi the ppend a m l ele h 'e i y i ven 1 1 -11 a fluid n zes ur i iz hg meeh $51 having a percussive motor, ,a feedleg for ac} "teeminh ing adjacent sa sh p pettien, l i d ame-mu een r ef ith e dingef the m 1 r source of gfluid {pressure and the other with said feed leg, said handle having a counter bore at the outer end of one of said passages,

e ye r .zhleehin .e id ieehnte h n haying r 15 .peesege rranged t .eeni ee isaid feed leg passage to said supply passage or to atmosphere, said block having a stem, a retainer member sleeved over said stem and having a flat outer face, an operating handle secured to s id stem a d hating e .fla .taee o ee P- .e 'ateswith th iae o said member, and ,sprin iiiiteepeeed between a hleek en sa d member yieldi g y .to m intain pseid flfaeeei .f fi tiie ah ehtaet.

A etee ying handl f ie teehme t .te a fluid pressur toning machin eemp ti elehahk. ,PQ Z iQ a d e g ip ipe t en, said shank pe iti n having .epeeej ixie pas age hand e exinge eeiinter he e a the .eute i nje ,ef ene o sa ,pessege and .a ren her t etmesnhe e eemmhn lee ing .With said e en- ,g t .pertie ;o,fthestea yinghanm the e pf teiibeee, 1e, welve .hleekfin said ee mterhe halving .mean for iinter enn et ng said pas-"Q ven pert; d h e k ih ring' ye stem,

sa es .endi er eenne t hgene .e s id [p ssage to .se. a retaining membe le ved e said esteem an js jared.t s id; ehd1e,en eperetinghenidle e sei d ya j lseeured to .efe' s em, en

means establ shing irietiiqna ,eentee h tr een gse dihe be' and aid 9 atihg handle for l.ia .nteiii hg a va e; 'le k'ine n i adjusted position.

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' HEW QOTFABJiELL- 

